The test seems to assume that there is one American culture divided into bubble levels — if one is not a commoner, then one is insulated in an upper-class bubble. That is not the case.
(Might I note that my inner-city Black students are just as bubble-insulated from knowledge of the characters of those in the upper classes as the upper classes are insulated from knowledge of their characters?)
Some of us are mixed culturally, some are Third Culture Kids (TCKs – also called TransCultural Kids) who, depending on ones point of view, are either in no insulating bubble or are in bubbles that are neither upper nor lower ("common") class American.
I have to admit that I have so little knowledge of the string restaurants mentioned that I don't know what "class" they are supposed to represent. We usually go to family run ethnic places, most often Asian, in which I am often the only non-Asian — and since I can't see myself, I don't feel "different."